Ryan Agro Acid Rain Lab Purpose: I.V: Type of Stone D.V: Mass of rock after 5 days Control: Stone in Water Problem Statement: Acid rain causes some stones to loose mass. Which type of Stone is the best to prevent a loss in mass? Hypothesis: If the material used is affected by acid rain, then it will lose mass when exposed o vinegar, because of chemical changes. Procedure: 1. Gather Materials(container with lid, graduated cylinder, vinegar, balance, limestone, marble, red sandstone, granite) 2.
The salts will be dissolved in distilled water by small quantities until the reaction reaches When ionic compounds dissolve in water, they either absorb energy from or release energy to the surroundings. If a chemical reaction absorbs heat from the surroundings, it is an endothermic reaction. If a solution releases heat to its surroundings, it is an exothermic reaction. The enthalpy of dissolution is the enthalpy change associated with the dissolution of a substance in a solvent at a constant pressure. The change in enthalpy relies on the concentration of the salt solution, because different concentrations will produce different enthalpies.
Abstract: In this lab, the purpose was to determine the reaction rate for the absorption (concentration) of the reaction. The components needed for the rate law in this lab are the k value as well as determining if the reaction is zero, first, or second order. The graphical method will be used to determine the order as well as the “K” value. The absorption of the green light increased over time as the reaction occurred. Background: A reaction rate is the decrease in concentration of a reactant or the increase in concentration of a product with time.
The more CO2 produced over this time, the higher the rate of reaction. In this equation, there are 3 possible independent variables: a) changing the size of the marble chips (e.g. large, small, powdered) whilst keeping the mass the same, b) changing the mass of the marble chips whilst keeping the size the same (e.g. all powdered), or c) changing the concentration of the hydrochloric acid. In equation 2, the hydrogen is measured by the loss of mass.
Chapter Two: Freezing Point Depression Measurements Purpose: The purpose of this lab is to measure freezing points and freezing point depression for several solutions. The freezing point depression constant (Kf) for p-xylene was calculated from freezing point measurements and used to estimate the molar masses of three unknown solutes in a p-xylene solution. The end goal of this lab experiment is to correctly identify these three unknown solutes. The molar mass of a solute is able to be determined through freezing point depression measurements because the increase in solutes disrupts crystal formation, requiring a lower temperature to form a lattice. This colligative property is important in many industries, but is clear to see when using ordinary salt to remove ice from steps or a driveway.
Combustion of organic compounds can result in detrimental impacts on the environment such as the generation of acids and production of carbon monoxide, particulates and soot. When organic compounds that contain sulphur, nitrogen are combusted, the reaction may produce gases such as sulphur dioxide, nitrogen dioxide and carbon dioxide. When these compounds react with water molecules, it will produce acids which fall as acid rain.Acids dissolve calcium carbonate, meaning that monuments made from marble and limestones are particularly vulnerable. In environmental terms, acid rain flows into water bodies. Acid rain releases aluminium from the soils into the water, an element which is highly toxic to many species of aquatic organisms.
Greater with a concentration from 2.5 to 7.5g/l. Duodenum Body temperature at 37*C is slightly lower than the optimal temperature . may increase sucrase activity since optimal temperature for activity i a 40*C ph 6 of the intestine and the temperature of the body maintains a consistent enzyme activity. increases with increasing sucrose concentration until a plateau is reached. AS substrates are initially added, the activity is higher and then it reaches a plateau with increase.
Thermal decomposition of carbonates Introduction: Carbonates decompose when they are heated, producing calcium oxide and carbon dioxide. Carbon dioxide can be detected using lime water. Calcium carbonate calcium oxide + carbon dioxide CaCO3 CaO + CO2 Other metal carbonates decompose in the same way. Here are the equations for the thermal decomposition of copper carbonate: copper carbonate copper oxide + carbon dioxide CuCO3 CuO + CO2 Hypothesis: some metal carbonates decompose more easily than others when they are heated. Aim: The times taken for a chemical reaction to take place metals high up in the reactivity series (such as calcium) have carbonates that take a lot of energy to decompose them.
Then allow test tubes to remain at various temperatures for 5minutes, remove the test tubes and add 2cm of catechol and shake to allow them mix. Finally the record the results. As temperature increases the rate of enzyme activity increases until it reaches its optimum point, in this graph the optimum point is 20-60 oC, This is the point where enzymes works best if temperature increases above the optimum point the rate of enzyme activity decreases until the point where the enzymes are denatured, the color intensity gets darker as temperature increases. Effects of pH on Enzyme Activity pH directly has an effect on the active site, and is therefore important to have proper pH,however high or lower ph. affect the enzyme activity, to get enzymes working there should be proper ph.
How does the rate of reaction in Task 2 compare with the rate in Task 1? Suggest a reason for the change. By comparing the two curves and the times taken to reach 0.0 g (the last times on the list), predict the time it would take for the reaction to finish if 100 chips were used. Task 3 Press back but not clear and change the number of chips to 100 but leave the acid concentration at 1.0 mol/dm3 . Click start and take readings as often as possible (by clicking the take readings button) until the mass reaches 0.0 g. Stop the reaction immediately.